Updated Minimum Retroreflectivity Levels

Final Report

APPENDIX B: RAW DATA FROM MERCIER ET. AL.

This appendix summarizes all of the sign visibility data collected by Mercier et al.(9) The complete set of data was never published and therefore is included here for documentation purposes. Table 32 provides a summary of the signs used in the study. The demand luminance results are shown in order following table 32.

The graphs that follow show the luminance demand data for the signs listed. The graphs can be matched with the data in table 32 using the graph code in the last two columns of the table and in the titles of the graphs. The graphs were scanned out of a draft final report and some information was lost in the conversion. The x-axis shows subject age in years. The y-axis shows the log luminance in cd/m2. The solid data points represent the demand luminance predicted by CARTS. The open points represent the subjects' performance